CN102707248B - Device for measuring magnetostriction in dual-channel capacitance method and method thereof - Google Patents
Device for measuring magnetostriction in dual-channel capacitance method and method thereof Download PDFInfo
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- CN102707248B CN102707248B CN201210174911.7A CN201210174911A CN102707248B CN 102707248 B CN102707248 B CN 102707248B CN 201210174911 A CN201210174911 A CN 201210174911A CN 102707248 B CN102707248 B CN 102707248B
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Abstract
The invention belongs to the technical field of measurement, and particularly relates to a device for measuring magnetostriction in a dual-channel capacitance method and a method thereof. The device comprises a sample position and probe position adjusting mechanism (1), external magnetic fields (18) at the two ends of the sample position and probe position adjusting mechanism (1) and a displacement data processing system (2) with a first electrical box channel (11) and a second electrical box channel (12). In accordance with the principle of a parallel plate capacitor, the amount of extension or contraction of a sample is measured indirectly via measuring changes in the capacitance between a movable sample electrode formed by two groups of samples (14) and a fixed electrode formed by probe electrodes (8-1 and 8-2) in the external magnetic fields, and thus the measurement of magnetostriction is completed and is displayed via dual channels. The device for measuring the magnetostriction in the dual-channel capacitance method has the advantages of simple structural design, high accuracy of measurement and high reliability.
Description
Technical field
The invention belongs to field of measuring technique, be specifically related to the magnetostrictive devices and methods therefor of a kind of binary channels capacitance measurement, the magnetostriction that is applicable to measure sample, is particularly useful for the magnetostriction of the bar-shaped sample that cross-sectional area is less.
Background technology
Under the effect of outside magnetic field, the yardstick of ferromagnetic material can change, and this phenomenon is called magneto-striction phenomenon.Magnetostriction materials are important energy and information conversion function materials, and magnetostriction coefficient is undoubtedly a magnetics parameter of most critical, because the magnitude of magnetostriction coefficient is less, 10
-3-10
-7scope, therefore realizing Measurement accuracy is a technical barrier.
According to existing technical conditions, the measuring method of magnetostriction coefficient has little angle method of rotation, strain resistor method, optical method, tunnel probe method and capacitance method.Little angle method of rotation is applicable to measure the magnetostriction coefficient of band shape or filamentary material, its principle is by regulating the size of DC bias field so that deflection angle keeps constant under the effect of differential tension, therefore adjustable factor is many, Tensity size, DC bias field and deflection angle all can affect final measurement result, but the magnetostriction coefficient measurement of current band shape or filamentary material still be take little angle method of rotation as main.Strain resistor method is applicable to measure the magnetostriction coefficient of membraneous material or irregular small sample, its principle is that the resistance strain gage as brachium pontis is attached on testing sample, the variation that the variation of sample length is converted into resistance is measured. due to the impact of the factor such as sample temperature, magnetoresistance effect in measuring process, in circuit, there will be more serious drift phenomenon, cause measuring and be difficult to accurately carry out, but in strain resistor method measurement links, sample preparation is comparatively simple, do not need special project organization, therefore application is comparatively general.Optical method is also applicable to measure the magnetostriction coefficient of block sample, detects the variable quantity of sample free end length by laser light path, and measuring accuracy is high, but laser equipment is more expensive, and manufacturing cost is high.Tunnel probe method is a kind of magnetostriction measurement method of recent development, for measuring the magnetostriction coefficient of wire sample.Capacitance method is the principle according to parallel plate capacitor, and under externally-applied magnetic field, by measuring the capacitance variations between sample and sensor plate, the electric capacity of plate condenser and the spacing of the two-plate relation that is inversely proportional to, measures the amount of elongating or shortening of sample indirectly.
Wherein, capacitance method has higher measuring accuracy than little angle method of rotation and strain resistor method, and principle is simple.(ten thousand is red for Wan Hong etc., Qiu is lost, thank to great waves, Si Yongmin, Yang Deming, < < capacitive displacement method is accurately measured the magnetostriction coefficient > > of thin magnetic film, functional material, 2002, vol.33, 262-264 page) utilize this principle to measure the magnetostriction coefficient of film sample, but directly do not measure the flexural deformation of film sample and the relation of externally-applied magnetic field, but between is looked for corresponding relation indirectly by capacitive displacement measuring instrument, this has just increased measuring uncertainty undoubtedly.(the B.Kundys such as B.Kundys, Yu.Bukhantsev, and S.Vasiliev et al., Threeterminal capacitance technique for magnetostriction and thermal expansion measurements, Review of Scientific Instruments, 2004, vol.75,2192-2196.) utilize the magnetostriction coefficient of capacitance measurement sample, sample one end is fixed, one end is connected with travelling electrode by lever, forms one group of electric capacity with fixed electorde, is single channel measuring method.Because the order of magnitude of magnetostriction coefficient is very little, 10
-3-10
-7scope, so fixed sample or can impact measurement result with the machine error that lever connecting link is brought.These factors have been brought adverse effect to measuring the Magnetostrictive Properties of sample above, have affected the accuracy of measuring.
Summary of the invention
For the problems referred to above, an object of the present invention is to provide the magnetostrictive device of a kind of binary channels capacitance measurement, its structural design is simple, highly sensitive, and precision stability is good, and cost is low, can realize contactless measurement sample magnetostriction coefficient.
Another object of the present invention is to provide a kind of use said apparatus and measures magnetostrictive method.
Theoretical foundation of the present invention be the electric capacity of parallel plate capacitor and polar plate spacing from relation meet:
Wherein ε is medium specific inductive capacity, and S is polar plate area, and d is polar plate spacing from, C
0for departing from electric capacity.According to formula, electric capacity and polar plate spacing are from being inversely proportional to.
Principle of work of the present invention is: adopt suitable sample, the parallel end face in sample two ends respectively forms one group of parallel plate capacitor with an electrode, thereby form altogether two groups of plane-parallel capacitors, forming binary channels measures, reduced fixedly link of sample one end, the impact of having avoided the machine error that fixedly link is brought to cause measurement result, sample produces after magnetostriction under different magnetic field effect, sample elongates or shortens, two groups of electric capacity increase simultaneously or reduce, voltage magnitude between two pole plates is directly proportional to distance, voltage signal is set up and the contacting of distance after series of processes, binary channels data are added and directly read sample stroke, realized the magnetostriction measurement of sample.
According to foregoing invention principle, for realizing goal of the invention, the invention provides following technical scheme:
The magnetostrictive device of binary channels capacitance measurement, for measuring end flat sample parallel to each other 14, wherein, this device comprises:
Sample position and probe positions adjusting mechanism 1, be positioned on base 15, comprise: sample holder 3, for fixing an above-mentioned sample 14, there are two adjustable sensor 6-1 at sample 14 two ends, 6-2, sensor 6-1,6-2 front end has the first probe electrode 8-1 and the second probe electrode 8-2, probe electrode 8-1,8-2 and sample 14 coaxially arranged, the end flat of sample 14 respectively with probe electrode 8-1,8-2 forms air dielectric electric capacity;
Displacement data disposal system 2, comprise the first electric box passage 11 and the second electric box passage 12 that by cable, are connected with one end of two amplifiers 10 respectively, and the other end of two amplifiers 10 is respectively by sensor cable 9 and two sensor 6-1, and 6-2 connects;
Be positioned at the externally-applied magnetic field 18 at sample position and probe positions adjusting mechanism 1 two ends;
Sample 14 and sensor outer housing are by wire 13 ground connection.
Described sample 14 is bar-shaped sample.
Described sample holder 3 is semi-circular recesses, by limit spring sheet 4, sample 14 is fixed on sample holder.
Described sample 14 both ends of the surface are distinguished bonding copper sheet for sample electrode by conducting resinl.
Described two sensor 6-1,6-2 is fixing by open slot 7.
Described probe electrode 8-1,8-2 is separately fixed at sensor 6-1 by securing member 19, the front end of 6-2.
Described two sensors 6-1, there is the thread rack 16 that regulates threaded rod 17 in the outside of 6-2, by regulating threaded rod 17 to regulate respectively two sensors 6-1, the lateral attitude of 6-2.
Described device also comprises magnetic field measuring device.
The method comprises the steps:
1. preparation of samples: fixed sample is also prepared sample electrode;
2. equipment Alignment: adjust probe electrode 8-1,8-2 position, the fixed electorde of formation and the initial distance between sample electrode, arrange simultaneously and measure passage reading within equipment range;
3. measure: under the effect of externally-applied magnetic field 18, the capacitance variations of two group capacitors that measurement sample two ends and probe electrode form respectively; After the data that obtain are processed by displacement data disposal system 2, in the first electric box passage 11 and the corresponding reading sum of the second electric box passage 12, be the magnitude of magnetostriction of sample 14.
In described preparation of samples step, the both ends of the surface of sample 14 are by the conducting resinl copper sheet 5 that bonds, and sample 14 is positioned on sample holder 3, by limit spring sheet 4, form movable sample electrode.
In described equipment Alignment step, be: the position that regulates thread rack 16 before measuring by threaded rod 17, thereby regulate sensor 6-1, the lateral attitude of 6-2, probe electrode 8-1 is set, initial distance between the formed fixed electorde of 8-2 and sample electrode arranges the first electric box passage 11 and 12 corresponding readings of the second electric box passage within its range simultaneously.
Described initial distance is 60-61 μ m.
The range of the first electric box passage 11 and the second electric box passage 12 is respectively 0-1000nm.
The end face diameter of described sample 14 or linear dimension are 2-20mm.
Compared with prior art, beneficial effect of the present invention is:
1, to have structural design simple, highly sensitive for the magnetostrictive device of binary channels capacitance measurement of the present invention, and precision stability is good, low cost, the advantage of contactless type;
2, adopt the measuring method of device of the present invention, reduced the machine error of single channel measuring method medium-height trestle, directly gather variable quantity;
3, capacitance method principle is measured magnetostriction and has been avoided temperature, the impact of the foeign elements such as magnetoresistance effect and external carbuncle.
Accompanying drawing explanation
Fig. 1 is the structural representation of the magnetostrictive device of binary channels capacitance measurement of the present invention;
Fig. 2 is sample position and probe positions reconditioner composition;
Fig. 3 is Fe
65co
35the magnetostriction variation relation figure of sample under additional magnetic fields, wherein horizontal ordinate H is the magnetic field intensity of externally-applied magnetic field 18, ordinate λ is the shown displacement of the first electric box passage.
Reference numeral
1 sample position and probe positions adjusting mechanism
2 displacement data disposal system 3 sample holders
4 limit spring sheet 5 copper sheets
6-1 first sensor 6-2 the second sensor
7 open slot 8-1 the first probe electrodes
8-2 the second probe electrode 9 sensor cables
10 amplifier 11 first electric box passages
12 second electric box passage 13 wires
14 sample 15 bases
16 thread rack 17 threaded rods
18 externally-applied magnetic field 19 securing members
Embodiment
Below in conjunction with accompanying drawing, further describe embodiments of the present invention.
The magnetostrictive device of a kind of binary channels capacitance measurement as shown in Figure 1, comprises sample position and probe positions adjusting mechanism 1, displacement data disposal system 2 and externally-applied magnetic field 18.
Wherein, sample position and probe positions adjusting mechanism 1, be positioned on base 15, comprise: sample holder 3, be used for fixing an above-mentioned sample 14, there are two adjustable sensor 6-1,6-2 in sample 14 two ends, sensor 6-1,6-2 front end has the first probe electrode 8-1 and the second probe electrode 8-2, probe electrode 8-1,8-2 and sample 14 coaxially arranged, the end flat of sample 14 respectively with probe electrode 8-1,8-2 forms air dielectric electric capacity.
Displacement data disposal system 2, comprise the first electric box passage 11 and the second electric box passage 12 that by cable, are connected with one end of two amplifiers 10 respectively, and the other end of two amplifiers 10 is respectively by sensor cable 9 and two sensor 6-1, and 6-2 connects.
Be positioned at the externally-applied magnetic field 18 at sample position and probe positions adjusting mechanism 1 two ends.Preferably, the magnetostrictive device of binary channels capacitance measurement can also comprise magnetic field measuring device, for measuring the magnetic field intensity of externally-applied magnetic field 18.
Preferably, sample 14 is bar-shaped sample, preferably the less bar-shaped sample of cross-sectional area.
Preferably, sample holder 3 is semi-circular recesses, by limit spring sheet 4, sample 14 is fixed on sample holder.
Preferably, sample 14 and sensor outer housing are by wire 13 ground connection.
Preferably, sample 14 both ends of the surface are distinguished bonding copper sheet for sample electrode by conducting resinl.
Preferably, two sensor 6-1,6-2 is fixing by open slot 7.
Preferably, probe electrode 8-1,8-2 is separately fixed at sensor 6-1 by securing member 19, the front end of 6-2.
Preferably, two sensors 6-1, there is the thread rack 16 that regulates threaded rod 17 in the outside of 6-2, by regulating threaded rod 17 to regulate respectively two sensors 6-1, the lateral attitude of 6-2.
Wherein, sample 14 can be cylindric, cube etc., and has certain cross-sectional area.
According to binary channels capacitance measurement magnetostriction apparatus proposed by the invention, the present embodiment has been measured Fe
65co
35the magnetostriction variable quantity of bar-shaped amorphous alloy under additional magnetic fields.
The present embodiment sample used is the cylindrical sample of Φ 2 * 20mm, and sample both ends of the surface are parallel, and adopts the copper sheet 5 of conductive silver glue bonding Φ 10 * 2mm.
As shown in Figure 1, 2, sample 14 is positioned on specimen holder 3, fixing by limit spring sheet 4, forms movable sample electrode.Probe electrode 8-1,8-2 is positioned at sensor 6-1, and 6-2 front end is fixing by securing member 19, is fixing electrode.And sensor 6-1,6-2 and sample 14 are connected and pass through wire 13 ground connection.
Distance between two fixed electordes and sample electrode is the reading of corresponding the first electric box passage 11 and the second electric box passage 12 respectively.Before measurement, by threaded rod 17, regulate the position of thread rack 16, thread rack 16 is from sensor 6-1, the inward at both ends transverse shifting of 6-2, with sensor 6-1,6-2 contact, thereby promote sensor 6-1,6-2 is transverse shifting to the inside, is positioned at sensor 6-1, the fixed electorde of 6-2 front end and the initial separation between sample electrode to regulate.In the present embodiment, when initial separation is 60 μ m, the first electric box passage 11 and the corresponding reading of the second electric box passage 12 are 0, and when initial separation is 61 μ m, the first electric box passage 11 and the corresponding reading of the second electric box passage 12 are 1000nm.The initial distance regulating between two fixed electordes and sample electrode by screw rod 17, makes the first electric box passage 11 and the corresponding reading of the second electric box passage 12 between 0-1000nm.After adjusting, adjustable screw bar 17, moves helical mount 16 laterally, not with sensor 6-1, and 6-2 contact.
Start test, under the effect of externally-applied magnetic field 18, sample length changes, and causes the capacitance variations between sample electrode and fixed electorde, is reflected in the variation of the first electric box passage 11 and the second electric box passage 12 corresponding readings.Voltage magnitude between two pole plates is directly proportional to distance, voltage signal amplifies through testing circuit, after shaping, passing ratio is calibrated after amplifying again, foundation contacts with distance, with numerical value form, show the variation of displacement, binary channels data are added and directly read sample stroke, finally realized the magnetostriction measurement of sample.
As seen from Figure 3, by Fe
65co
35the made sample of bar-shaped amorphous alloy, under externally-applied magnetic field 18 effects, has produced obvious magneto-striction phenomenon, the former long 20.9mm of sample, and the saturated rear deflection of mangneto is 570nm, therefore last that saturation magnetostriction be 27.The stability of experimental data is fine.
Claims (14)
1. the magnetostrictive device of binary channels capacitance measurement, for measuring end flat sample parallel to each other (14), is characterized in that: this device comprises:
Sample position and probe positions adjusting mechanism (1), be positioned on base (15), comprise: sample holder (3), be used for fixing an above-mentioned sample (14), there are two adjustable sensor (6-1 at sample (14) two ends, 6-2), sensor (6-1,6-2) front end has the first probe electrode (8-1) and the second probe electrode (8-2), probe electrode (8-1,8-2) coaxially arranged with sample (14), the end flat of sample (14) forms air dielectric electric capacity with probe electrode (8-1,8-2) respectively;
Displacement data disposal system (2), comprise the first electric box passage (11) and the second electric box passage (12) that by cable, are connected with one end of two amplifiers (10) respectively, and the other end of two amplifiers (10) connects by sensor cable (9) and two sensors (6-1,6-2) respectively;
Be positioned at the externally-applied magnetic field (18) at sample position and probe positions adjusting mechanism (1) two ends;
Sample (14) and sensor outer housing are by wire (13) ground connection.
2. the magnetostrictive device of binary channels capacitance measurement as claimed in claim 1, is characterized in that: described sample (14) is bar-shaped sample.
3. the magnetostrictive device of binary channels capacitance measurement as claimed in claim 1, is characterized in that: described sample holder (3) is semi-circular recesses, by limit spring sheet (4), sample (14) is fixed on sample holder.
4. the magnetostrictive device of binary channels capacitance measurement as claimed in claim 1, is characterized in that: described sample (14) both ends of the surface are distinguished bonding copper sheet for sample electrode by conducting resinl.
5. the magnetostrictive device of binary channels capacitance measurement as claimed in claim 1, is characterized in that: described two sensors (6-1,6-2) are fixing by open slot (7).
6. the magnetostrictive device of binary channels capacitance measurement as claimed in claim 1, is characterized in that: described probe electrode (8-1,8-2) is separately fixed at the front end of sensor (6-1,6-2) by securing member (19).
7. the magnetostrictive device of binary channels capacitance measurement as claimed in claim 1, it is characterized in that: two sensor (6-1, there is the thread rack (16) of adjusting threaded rod (17) in outside 6-2), by regulating threaded rod (17) to regulate respectively the lateral attitude of two sensors (6-1,6-2).
8. the magnetostrictive device of binary channels capacitance measurement as claimed in claim 1, is characterized in that: described device also comprises magnetic field measuring device.
9. the magnetostrictive method of measurement device described in employing claim 1, is characterized in that: the method comprises the steps:
1. preparation of samples: fixed sample is also prepared sample electrode;
2. device calibration: adjust probe electrode (8-1,8-2) position, the fixed electorde of formation and the initial distance between sample electrode, arrange simultaneously and measure passage reading within device range;
3. measure: under the effect of externally-applied magnetic field (18), the capacitance variations of two group capacitors that measurement sample two ends and probe electrode form respectively; After the data that obtain are processed by displacement data disposal system (2), in the first electric box passage (11) and the corresponding reading sum of the second electric box passage (12), be the magnitude of magnetostriction of sample (14).
10. the magnetostrictive method of measurement as claimed in claim 9, it is characterized in that: in described preparation of samples step, the both ends of the surface of sample (14) are by the conducting resinl copper sheet (5) that bonds, and sample (14) is positioned on sample holder (3), by limit spring sheet (4), form movable sample electrode.
The magnetostrictive method of 11. measurement as claimed in claim 9, it is characterized in that: described device calibration steps is: the position that regulates thread rack (16) before measuring by threaded rod (17), thereby regulate sensor (6-1, lateral attitude 6-2), probe electrode (8-1 is set, 8-2) the initial distance between formed fixed electorde and sample electrode arranges the corresponding reading of the first electric box passage (11) and the second electric box passage (12) institute within its range simultaneously.
The magnetostrictive method of 12. measurement as claimed in claim 9, is characterized in that: described initial distance is 60-61 μ m.
13. magnetostrictive methods of measurement as described in claim 9 or 11, is characterized in that: the range of the first electric box passage (11) and the second electric box passage (12) is respectively 0-1000nm.
The magnetostrictive method of 14. measurement as claimed in claim 9, is characterized in that: the end face diameter of described sample (14) or linear dimension are 2-20mm.
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| CN103115562B (en) * | 2013-01-21 | 2016-06-01 | 北京工业大学 | High ferro non-fragment orbit displacement monitor |
| CN103576107B (en) * | 2013-10-25 | 2016-05-25 | 北京科技大学 | A kind of method and device thereof of measuring overall magnetostriction coefficient |
| CN104035058B (en) * | 2014-06-09 | 2016-08-31 | 浙江大学 | Magnetostriction materials parameter characteristic test devices and methods therefor |
| CN106291408B (en) * | 2016-10-11 | 2023-06-09 | 中国计量大学 | Magneto-electric converter based on magnetostrictors and electrets |
| CN106646293B (en) * | 2016-10-14 | 2019-02-26 | 东北大学 | A kind of device and method of high precision and large measuring range non-contact measurement magneto-strain |
| CN109570137B (en) * | 2019-01-18 | 2024-03-29 | 西南交通大学 | Ultrasonic descaling device with self-diagnosis function |
| RU2721718C1 (en) * | 2019-10-21 | 2020-05-21 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Петрозаводский государственный университет" | Apparatus for measuring the dependence of the magnetostriction of a nonrigid object on the value of the external magnetic field |
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| US2850697A (en) * | 1954-10-19 | 1958-09-02 | Allis Chalmers Mfg Co | Device for measuring magnetostriction |
| JP4257433B2 (en) * | 2005-03-28 | 2009-04-22 | 国立大学法人 東京学芸大学 | A method for simultaneous measurement of magnetostriction and magnetization, a method for creating a standard sample for calibration of a magnetostriction measurement device using the method, and a method for calibration of a magnetostriction measurement device using the calibration standard sample created by the creation method. |
| CN100557457C (en) * | 2007-08-20 | 2009-11-04 | 北京航空航天大学 | Device for measuring magnetoconstriction performance |
| CN100453964C (en) * | 2007-10-12 | 2009-01-21 | 东南大学 | Electric capacity method testing device for electrostrictive material characteristic |
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